It is non fillable septic tanks. Only less space is required. Blockage can be prevented easily. Mosquito, files can be prevented. This makes the place clean and tidy. This process will also prevent water born disease will not affect the health issues.
Maintainace is easy, does not depend on any energy source and also it is effluents are odourless. 95% is purified water are evaporated under the ground so the ground water is also good. The tank which is used by us is made up of Bio-cements which will not be corroded for life long.